virtualization - Non-manual creation of appliance image (OVA) -

i want distribute base os (ubuntu 14.04) , app+dependencies appliance in ova format. once users deploy in virtualization systems, have operational system

i can manually manually creation vm, installing app+dependencies , exporting in ova format hypervisor (e.g. vbox)

is there non-manual automated way doing same? bcoz want build continuous integration env. vmware studio looks option there hasn't been updates since 2012

the 2 tools i've used packer (www.packer.io) , veewee (??). both allow build virtual appliances describing